摘 要
近來已經有許多關於鐵磁性材料透過非磁性物質產生交換耦合的研究，例如：Fe/Cr、Co/Cr、Co/Ru這些系統已經被廣泛的探討，在本實驗中我們成功的找到一個新的系統— NiFe80Fe20/Ru/ NiFe80Fe20 trilayer，並利用MOKE的量測得到與前人相符合的振盪現象。
本實驗是利用MBE系統成長高品質的 NiFe80Fe20/Ru/ NiFe80Fe20 trilayers，討論此trilayers隨著Ru 厚度變化出現反鐵磁耦合振盪的情形。實驗中藉由 RHEED、x-ray繞射來探討其磊晶結構；LMOKE、VSM、SQUID來量測其磁性；AFM來觀察其原子表面型態。

Abstract
The oscillation of the interlayer coupling as a function of the spacer thickness has been extensively studied in recent years. In particular, Fe/Cr, Co/Cr, Co/Cu systems have been studied by different authors. In this work, we find a new trilayer system—NiFe80Fe20/Ru/ NiFe80Fe20 and the results in good agreement with oscillation behavior found in the other systems.
By molecular beam epitaxy (MBE)，the author has prepared high-quality NiFe80Fe20/Ru/ NiFe80Fe20 trilayer .This thesis focus on the oscillation behavior of magnetic coupling as a function of the Ru thickness in Ni80Fe20／Ru／Ni80Fe20 trilayers. Reflection high-energy electron diffraction (RHEED) and X-ray diffraction (XRD) have been employed to study the epitaxial relation and surface of the trilayers structure. Longitudinal magneto-optical Kerr effect (LMOKE) and vibration sample Magnetometer (VSM) have been used to investigate the magneto-optical properties

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